The options file contains all the settings you might need to customise the mod to your specifications.

The option file is located in steamapps\workshop\content\268500\682156617\Config. It's the XComTotalAdventWeaponry.ini file.

This part controls a few stats for the weapons, as well as containing all the statistics for the SMG.

CONVENTIONAL_ENABLED/MAGNETIC_ENABLED/BEAM_ENABLED
These three options simply enable or disable that tier of weaponry.

SMGS_ENABLED
This sets whether or not the SMG weapons are enabled.

CONVENTIONAL_WEAPON_MODS/MAGNETIC_WEAPON_MODS/BEAM_WEAPON_MODS
This sets how many weapon modifications each tier can have. By default, it's set to the XCOM2 stock settings of 1/2/2.

LONG_BARREL_SNIPER_RIFLE
This enables the longer barrelled sniper rifle model. By default this is set to false, because personally, I prefer the shorter barrelled version of the sniper rifle.

The next section is all the statistics for the SMGs, they follow the standard XCOM 2 format, and they're fairly self explanatory, except for the range tables.
They are simply how much of an accuracy bonus/nerf you get at each distance. For example, this is a line of the table:
MIDSHORT_CONVENTIONAL_RANGE[5] = 18
This means that if you are 5 tiles away with a Bullet SMG, you get a 18% bonus to your aim.

This part just controls the movement and detection range bonuses for the SMGs.

This controls the schematics for buying/upgrading the ADVENT weapons.

CONVENTIONAL_SCHEMATICS_ENABLED/MAGNETIC_SCHEMATICS_ENABLED/BEAM_SCHEMATICS_ENABLEDThis controls what tiers of schematics are enabled. The schematics are what show up in the Engineering "Build Items" screen.
This option has no effect if a tier of weaponry is fully disabled in the X2Item_AdventWeaponry section.

START_WITH_CONVENTIONAL_WEAPONS
This controls whether you start with conventional weaponry already in your inventory, if the conventional schematics are disabled.

***_SCHEMATIC_SUPPLYCOST/***_SCHEMATIC_ALLOYCOST/***_SCHEMATIC_ELERIUMCOST
These options set how much supplies, alien alloys and elerium each tier of ADVENT weaponry costs to upgrade.

SMG_***_SCHEMATIC_SUPPLYCOST/SMG_***_SCHEMATIC_ALLOYCOST/SMG_***_SCHEMATIC_ELERIUMCOST
These options set how much supplies, alien alloys and elerium it costs to upgrade the SMGs. This option is here if you don't have the Long War Studios' SMG Pack installed but you want the ADVENT SMGs. The default options assume you have the LWS SMGs installed. If you don't, the commented out values are what the LWS SMGs cost to upgrade to.

ARELWSMGSINSTALLED
This option is just there to check if the LWS SMGs are installed. If the LWS SMGs are installed, and this option is set to true, SMGs require the equivalent SMG upgrade to be purchased. If they aren't installed, then the SMGS require the assault rifle equivalent to be purchased before you can purchase the ADVENT SMG upgrade.


Hopefully this has cleared up the options. If any more options are added, then I'll update this with the new options and what they do.